“Ashes’ Will” – “A Sad Journey” [Campaign 2, Mission 2]

This. Only the logistics might not be available, and it's not clear if it's really needed, as it's a single-player game. Instead, you can take something for combat, like defense.

Logistics don't seem to be very good for Necromancers, but maybe Chaos will be useful? I don't remember who and how you'll have to fight.

Added 1 minute ago

Defense with BDP and go through everything with 14 ghosts.

In his first playthrough, he had both defense and attack (there's a screenshot a couple of posts above). But it didn't help much.